Abstract: The speed of any motor has to be increased from zero and should be brought to the operating speed, this is called as starting of a motor. DC motors speed can be controlled over wide range either by changing the voltage or by changing strength of current in its winding. Initially DC motors were powered by existing direct current power distribution system so these motors were the first to be widely used. A DC motor is a self starting motor, yet certain external methods are used for starting DC motor. This paper gives the study of different types of DC motors and the need of an external starter for these DC motors.
Keywords: DC Motors, Speed Regulation, Armature, Field winding.